Emergency Management Science and Technology:An international transdisciplinary platform

Clear evidence indicates that the earth is experiencing a gradual increase in global average temperature,which is deemed to contribute considerably to the frequent occurrence of extreme natural events,including droughts,flooding,hurricanes,storm surges,wildfires,desertification,sandstorms,landslides,debris flows,plague,and crop biological disasters.Additionally,human-related or technological disasters,such as industrial and transportation accidents,further facilitate the risk of human exposure to extreme urban hazards,and cause high casualties,fatalities and financial losses.These worldwide natural disasters and tremendous production safety accidents have had a huge negative impact on human life and posed devastating threats to social stability.The last few decades have witnessed a dramatic increase in disastrous events.Over the past decade,more than 7,300 disastrous events were reported worldwide,an increase of 73%compared to those reported between 1980 and 1999[1].In order to improve the response capability and minimize property damage when encountering various types of disasters,emergency management(EM)systems have been established rapidly in most countries and regions.The development of timely and effective EM systems has become increasingly attractive,primarily aiming to help and enable emergency managers to prepare for unanticipated disasters and respond to urgent events.The definition of EM is given as an integrated decision support system composed of a variety of tasks that covers the lifecycle of an emergency event[2].Effective prevention of emergency events serves as a key role in EM systems aimed at minimizing or eliminating losses and impacts in advance.

Phenol Oxidation by Combined Cavitation Water Jet and Hydrogen Peroxide

The paper presents results of phenol oxidized under the conditions of high temperature created during collapse of cavitation bubbles.The degradation efficiency has been greatly improved by using cavitation water jets combined with H2O2 as demonstrated in laboratory tests.Various factors affecting phenol removal ratio were ex-amined and the degradation mechanism was revealed by high performance liquid chromatography(HPLC).The re-sults showed that 99.85% of phenol was mineralized when phenol concentration was 100 mg·L-1 with pH value of 3.0,H2O2 concentration of 300 mg·L-1,confining pressure of 0.5 MPa,and pumping pressure of 20 MPa.The in-termediate products after phenol oxidation were composed of catechol,hydroquinone and p-benzoquinone.Finally,phenol was degraded into maleic acid and acetic acid.Furthermore,a dynamic model of phenol oxidation via cavi-tation water jets combined with H2O2 has been developed.

Temperature field simulation of gob influenced by atmospheric pressure

The current temperature field model of mine gob does not take the boundary conditions of the atmospheric pressure into account, while the actual atmospheric pressure is influenced by weather, so as to produce differences between ventilation negative pressure of the working face and the negative pressure of gas drainage in gob, thus interfering the calculated results of gob temperature field. According to the characteristics of the actual air flow and temperature change in gob, a two-dimensional temperature field model of the gob was built, and the relational model between the air pressure of intake and outlet of the gob and the atmospheric pressure was established, which was introduced into the boundary conditions of temperature field to conduct calculation. By means of analysis on the simulation example, and comparison with the traditional model, the results indicate that atmospheric pressure change had notable impact on the distribution of gob temperature field. The laboratory test system of gob temperature field was constructed, and the relative error between simulated and measured value was no greater than 9.6%, which verified the effectiveness of the proposed model. This work offers theoretical basis for accurate calculation of temperature and prediction of ignition source in mine gob, and has important implications on preventing spontaneous combustion of coal.